This membrane is usually located on the regions that contain the flagella and is linked to the inner part of the plasma membrane by bar-like links.Īpart from the polar membrane, all species have also been shown to contain intracellular poly-b-hydroxybutyrate (PHB). Motility of these organisms is made possible by one or several flagella located at one or both poles of the cell body.Īpart from the typical plasma membrane, all Oceanospirillum species have a special type of membrane known as polar membrane. pusillum) have a characteristic clockwise helix. japonicum, researchers noticed that the general shape of these cells changed from elongated, helical cells with more than one complete turn (before culture) to slightly curved or s-shape.įor members of this genus with a helical shape, all species that have been examined (with the exception of O. In particular, changes in shape (to straight rods or coccoid) have been associated with prolonged culture of these organisms.įor instance, following the prolonged culture of O. However, this shape may vary from a fibroid shape which has a single complete turn, to a helical shape with several complete turns depending on the species.Īs well, a few species in this group have been shown to have a rod-like shape (straight rods). Like other Spirilla bacteria, members of the genus Oceanospirillum are characterized by a spiral shape. As compared to other Spirilla, Oceanospirillum has also been shown to contain DNA mol% G+C of between 42 and 48 percent. As such, they are unable to grow in an environment that does not provide this condition (e/.g freshwater-based medium). Here, they exist as aerobic chemoheterotrophic organisms and thus have a respiratory type of metabolism (they do not ferment carbohydrates).Īs marine organisms, research studies have shown these organisms to rely on a medium that contains seawater for their growth. As the name suggests, Oceanospirillum bacteria are commonly found in marine environments. Like the other Spirilla bacteria, members of this genus are small in size and range from 0.4 to 1.4 um in diameter (and 1.2 to 75um in length). Some examples of Oceanospirillum bacteria include O. Today, as already mentioned, Spirilla are divided into three main genera. Scott Wells proposed that the group be further divided into several genera. However, as many species began to be discovered over time, it became evident that they did not belong to the same group.įor this reason, scientists like Phillip B. The genus Spirillum was created in 1832 by Gottfried Ehrenberg, a German naturalist, anatomist, and microscopist.
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